Device and method for measuring characteristic parameters of rotor of hydro-generator

Abstract

The invention relates to a device and a method for measuring characteristic parameters of a rotor of a hydro-generator, the device comprises change-over switches RL1, RL2, RL3 and RL4, change-over switches RL5, RL6, RL7 and RL8 are respectively connected with multipath selection switches S1, S2, S3 and S4 to form four combined selection switch groups, the change-over switches RL1, RL2, RL3 and RL4 are respectively connected with the four combined switches, and the change-over switches RL1, RL2, RL3 and RL4 are respectively connected with the multipath selection switches S1, S2, S3 and S4. The multipath selection switches S1, S2, S3 and S4 in the four combination switches are connected to the AC impedance measurement module, the AC withstand voltage measurement module and the insulation resistance measurement module, and the change-over switches RL5, RL6, RL7 and RL8 are connected to the DC resistance measurement module. Automatic measurement of the AC impedance, the DC resistance, the AC withstand voltage and the insulation resistance of the hydro-generator rotor can be realized, the state of the rotor port is automatically switched in the whole measurement process, manual intervention is not needed, the measurement error can be reduced, the working intensity can be reduced, and the working efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment measurement, and in particular to a device and method for measuring characteristic parameters of a hydro-generator rotor. Background Art

[0002] A hydroelectric generator is a generator that uses a turbine as the prime mover to convert water energy into electrical energy. When water flows through the turbine, it converts water energy into mechanical energy. The turbine shaft drives the rotor of the generator, converting mechanical energy into electrical energy for output. The rotor of the hydroelectric generator is the rotating part of the hydroelectric generator. The rotor consists of a shaft, a bracket, a yoke, a magnetic pole, a current collector, etc., and is used to generate a magnetic field, convert energy, and transmit torque.

[0003] According to the requirements of DL / T 596-2021 "Preventive Test Procedures for Power Equipment", the AC impedance, DC resistance, AC withstand voltage and insulation resistance of the turbine generator rotor are mandatory items for preventive testing. At present, multiple different test instruments are required to complete all the above test items. Each instrument has its own test power supply, test leads and control system. The repeated configuration increases the size and weight of the instrument, and requires frequent replacement of test wiring and instrument operation. The test process is cumbersome and easily leads to unsafe factors. Summary of the invention

[0004] The present invention provides a device and method for measuring characteristic parameters of a hydro-generator rotor. The method does not require disconnection of wires during the measurement process. As long as the wires are connected at the beginning of the test, the parameters of various test items of the hydro-generator rotor can be automatically measured, and the wires do not need to be disconnected during the intermediate test process.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A device for measuring characteristic parameters of a hydro-turbine generator rotor. A port A and a port B are provided on one side of the hydro-turbine generator rotor. The port A is connected to a voltage terminal VA and a current terminal IA, and the port B is connected to a voltage terminal VB and a current terminal IB. The device comprises switching switches RL1, RL2, RL3 and RL4. The voltage terminal VA and the current terminal IA are respectively connected to one end of the switching switches RL1 and RL2, the voltage terminal VB and the current terminal IB are respectively connected to one end of the switching switches RL3 and RL4, the switching switches RL5, RL6, RL7 and RL8 are respectively connected to multi-way selection switches S1, S2, S3 and S4 to form four combination selection switch groups, the other ends of the switching switches RL1, RL2, RL3 and RL4 are respectively connected to one end of the four combination switches, the other ends of the multi-way selection switches S1, S2, S3 and S4 in the four combination switches are connected to an AC impedance measurement module, an AC withstand voltage measurement module and an insulation resistance measurement module, and the switching switches RL5, RL6, RL7 and RL8 are connected to a DC resistance measurement module.

[0006] The above-mentioned switches RL1, RL2, RL3 and RL4 are two-way two-speed switches, one of which is a suspended gear, and the two ways of the other gear are simultaneously connected to one of the four groups of combination switches and the multi-way selection switch.

[0007] The above-mentioned switching switches RL5, RL6, RL7, and RL8 are two-gear switches, one of which is a suspended gear, and the other gears are connected to the DC resistance measurement module.

[0008] Each of the above-mentioned multi-way selection switches S1, S2, S3 and S4 is provided with no less than four selection gears, three of which are respectively connected to the AC impedance measurement module, the AC withstand voltage measurement module and the insulation resistance measurement module, and the remaining gear is a suspended gear.

[0009] Using the above-mentioned measuring method of the device for measuring the characteristic parameters of the rotor of a hydro-turbine generator, there are a total of four test states during measurement. The AC impedance, DC resistance, AC withstand voltage and insulation resistance are measured by switching switches RL1, RL2, RL3, RL4, RL5, RL6, RL7, RL8 and switching multi-way selection switches S1, S2, S3, S4.

[0010] When measuring the AC impedance of the turbine generator rotor in the above four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current terminals to the AC impedance measurement module to start the measurement.

[0011] When measuring the DC resistance of the turbine generator rotor in the above four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 are switched to the DC resistance measurement module; finally, the multi-way selection switches S1, S2, S3 and S4 switch the non-measured voltage and current terminals to the suspended state to start the measurement.

[0012] When measuring the AC withstand voltage of the turbine generator rotor in the above four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3 and S4 switch the voltage and current terminals to the AC withstand voltage measurement module to start the measurement.

[0013] When measuring the insulation resistance of the turbine generator rotor in the above four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3 and S4 switch the voltage and current terminals to the insulation resistance measurement module to start the measurement.

[0014] The present invention provides a device and method for measuring characteristic parameters of a hydro-turbine generator rotor, which has the following beneficial effects: (1) The present invention can realize the automated measurement of the AC impedance, DC resistance, AC withstand voltage and insulation resistance of the hydro-turbine generator rotor, and the rotor port state is automatically switched during the entire measurement process without manual intervention.

[0015] (2) The present invention can reduce measurement errors, alleviate work intensity, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the connection between the measuring device of the present invention and the rotor of the hydro-generator; Figure 2 This is a schematic diagram of the switching of the AC impedance measurement switch of the hydro-generator rotor of the present invention; Figure 3 A schematic diagram of the switch switching for measuring the DC resistance of the rotor of the hydro-generator according to the present invention; Figure 4 A schematic diagram of the switch switching of the AC withstand voltage measurement of the rotor of the hydro-generator according to the present invention; Figure 5 A schematic diagram of the switch switching for measuring the insulation resistance of the rotor of the hydro-generator according to the present invention; Figure 6 It is a schematic diagram of the measuring device of the present invention and the two ports A and B of the hydro-generator rotor. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following content will systematically and completely describe the specific technical solutions of the present invention in combination with the drawings provided according to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] A method for measuring AC impedance, DC resistance, AC withstand voltage and insulation resistance of a hydro-generator rotor comprises a hydro-generator rotor, two voltage terminals VA and VB, two current terminals IA and IB, eight switching switches RL1, RL2, RL3, RL4, RL5, RL6, RL7 and RL8, four multi-way selection switches S1, S2, S3 and S4, four measurement modules are respectively a DC resistance measurement module, an AC withstand voltage measurement module, an insulation resistance measurement module and an AC impedance measurement module, and the wiring method of the hydro-generator rotor is as follows: Figure 1 shown.

[0019] There are two ports A and B on one side of the turbine generator rotor. Figure 6 As shown in the figure, port A is connected to voltage terminal VA and current terminal IA, port B is connected to voltage terminal VB and current terminal IB, voltage terminal VA is connected to switching switch RL1, current terminal IA is connected to switching switch RL2, voltage terminal VB is connected to switching switch RL3, current terminal IB is connected to switching switch RL4, switching switch RL1 controls switching switch RL5 and multi-way selection switch S1, switching switch RL2 controls switching switch RL6 and multi-way selection switch S2, switching switch RL3 controls switching switch RL7 and multi-way selection switch S3, switching switch RL4 controls switching switch RL8 and multi-way selection switch S4, multi-way selection switches S1, S2, S3, and S4 are connected to an AC impedance measurement module, an AC withstand voltage measurement module, and an insulation resistance measurement module, and switching switches RL5, RL6, RL7, and RL8 are connected to a DC resistance measurement module.

[0020] The present invention has four test states in total, and measures AC impedance, DC resistance, AC withstand voltage and insulation resistance by switching switches RL1, RL2, RL3, RL4, RL5, RL6, RL7 and RL8 and switching multi-way selection switches S1, S2, S3 and S4; the turbine generator rotor measurement switch is switched as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0021] When measuring the AC impedance of the turbine generator rotor, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current terminals to the AC impedance measurement module to start the measurement. Figure 2 As shown in , RL5, RL6, RL7, and RL8 are all downward, wherein the 3-connector and 6-connector of S1, S2, S3, and S4 are connected.

[0022] When measuring the DC resistance of the turbine generator rotor, switch the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals to the on state; then switch the four switches RL5, RL6, RL7, and RL8 to the DC resistance measurement module; finally, the multi-way selection switches S1, S2, S3, and S4 switch the non-measured voltage and current terminals to the suspended state and start the measurement. Figure 3 As shown in , RL5, RL6, RL7, and RL8 are all pointing upward.

[0023] When measuring the AC withstand voltage of the turbine generator rotor, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current terminals to the AC withstand voltage measurement module to start the measurement. Figure 4 As shown in , RL5, RL6, RL7, and RL8 are all downward, wherein the 1 connector and the 8 connector of S1, S2, S3, and S4 are connected.

[0024] When measuring the insulation resistance of the turbine generator rotor, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current terminals to the insulation resistance measurement module to start the measurement. Figure 5 As shown in , RL5, RL6, RL7, and RL8 are all downward, wherein the 2 connectors and 7 connectors of S1, S2, S3, and S4 are connected.

[0025] Measuring principle: DC resistance: Current sampling: A 250uΩ resistor is connected to the loop, and the voltage across the resistor is input to the OP07 op amp. The amplified signal is input to the 10-bit AD chip, and the current value is calculated by analyzing the output signal of the AD chip through the single-chip microcomputer. Voltage sampling: The voltage signal is input into the OP07 op amp after being divided by resistors. The amplified signal is input into a 10-bit AD chip. The output signal of the AD chip is analyzed by the single-chip microcomputer to calculate the voltage value. AC withstand voltage: Current sampling: The current value of the high-voltage core wire is sampled through the through-core current sensor, and the output signal of the current sensor is input into the OP07 op amp. The amplified signal is input into the 10-bit AD chip, and the output signal of the AD chip is analyzed by the single-chip microcomputer to calculate the current value. Voltage sampling: A 500K resistor is connected in parallel at the high voltage output, and the current signal flowing through the resistor is input into the OP07 op amp. The amplified signal is input into a 10-bit AD chip, and the output signal of the AD chip is analyzed by the single-chip microcomputer to calculate the voltage value. Insulation resistance: Current sampling: The current value of the high-voltage core wire is input into the OP07 op amp, and the amplified signal is input into the VF conversion chip to convert the voltage value into a frequency signal. The frequency value of the signal is measured by the single-chip microcomputer to calculate the current value. Voltage sampling: Connect a 100M resistor in parallel at the high voltage output, input the current signal flowing through the resistor into the OP07 op amp, input the amplified signal into a 10-bit AD chip, and calculate the voltage value by analyzing the output signal of the AD chip through the single-chip microcomputer When measuring the AC impedance of the turbine generator rotor, the voltage and current ends are switched to the AC impedance measurement module by connecting the multi-way selection switches S1, S2, S3, and S4, and the measurement is started; when measuring the DC resistance of the turbine generator rotor, the four switches RL5, RL6, RL7, and RL8 are switched to the DC resistance measurement module, and then the multi-way selection switches S1, S2, S3, and S4 switch the non-measured voltage and current ends to a suspended state, and the measurement is started; when measuring the AC withstand voltage of the turbine generator rotor, the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to a suspended state, and then the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current ends to the AC withstand voltage measurement module, and the measurement is started; when measuring the insulation resistance of the turbine generator rotor, the four switches RL5, RL6, RL7, and RL8 connected to the DC resistance module are switched to a suspended state, and then the multi-way selection switches S1, S2, S3, and S4 switch the voltage and current ends to the insulation resistance measurement module, and the measurement is started.

Claims

1. A device for measuring characteristic parameters of a hydro-generator rotor, wherein one side of the hydro-generator rotor has two ports A and B, wherein port A is connected to a voltage terminal VA and a current terminal IA, and port B is connected to a voltage terminal VB and a current terminal IB, and wherein: The device includes switching switches RL1, RL2, RL3 and RL4, the voltage terminal VA and the current terminal IA are respectively connected to one end of the switching switches RL1 and RL2, the voltage terminal VB and the current terminal IB are respectively connected to one end of the switching switches RL3 and RL4, the switching switches RL5, RL6, RL7 and RL8 are respectively connected to the multi-way selection switches S1, S2, S3 and S4 to form four combination selection switch groups, the other ends of the switching switches RL1, RL2, RL3 and RL4 are respectively connected to one end of the four combination switches, the other ends of the multi-way selection switches S1, S2, S3 and S4 in the four combination switches are connected to an AC impedance measurement module, an AC withstand voltage measurement module, and an insulation resistance measurement module, and the switching switches RL5, RL6, RL7, RL8 are connected to a DC resistance measurement module.

2. The device for measuring characteristic parameters of a hydro-generator rotor according to claim 1, characterized in that: The switches RL1, RL2, RL3 and RL4 are two-way two-gear switches, one of which is a suspended gear, and the two ways of the other gear are simultaneously connected to one of the four groups of combination switches and the multi-way selection switch.

3. The device for measuring characteristic parameters of a hydro-generator rotor according to claim 2, characterized in that: The switching switches RL5, RL6, RL7, and RL8 are two-gear switches, one of which is a suspended gear, and the other gears are connected to the DC resistance measurement module.

4. The device for measuring characteristic parameters of a hydro-generator rotor according to claim 3, characterized in that: Each of the multi-way selection switches S1, S2, S3 and S4 is provided with no less than four selection gears, three of which are respectively connected to the AC impedance measurement module, the AC withstand voltage measurement module and the insulation resistance measurement module, and the remaining gear is a suspended gear.

5. A method for measuring the characteristic parameters of a hydro-generator rotor using the device of claim 4, characterized in that: There are four test states in total during measurement. AC impedance, DC resistance, AC withstand voltage and insulation resistance are measured by switching switches RL1, RL2, RL3, RL4, RL5, RL6, RL7, RL8 and switching multi-way selection switches S1, S2, S3, S4.

6. A method for measuring the characteristic parameters of a hydro-generator rotor using the device of claim 5, characterized in that: When measuring the AC impedance of the turbine generator rotor in the four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3 and S4 switch the voltage and current terminals to the AC impedance measurement module to start the measurement.

7. A method for measuring the characteristic parameters of a hydro-generator rotor using the device of claim 5, characterized in that: When measuring the DC resistance of the turbine generator rotor in the four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 are switched to the DC resistance measurement module; finally, the multi-way selection switches S1, S2, S3 and S4 switch the non-measured voltage and current terminals to the suspended state to start the measurement.

8. A method for measuring the characteristic parameters of a hydro-generator rotor using the device of claim 5, characterized in that: When measuring the AC withstand voltage of the hydro-generator rotor in the four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3 and S4 switch the voltage and current terminals to the AC withstand voltage measurement module to start the measurement.

9. A method for measuring the characteristic parameters of a hydro-generator rotor using the device for measuring the characteristic parameters of a hydro-generator rotor as claimed in claim 5, characterized in that: When measuring the insulation resistance of the turbine generator rotor in the four test states, the two switches RL1 and RL3 connected to the voltage terminals VA and VB and the two switches RL2 and RL4 connected to the current terminals are switched to the on state; then the four switches RL5, RL6, RL7 and RL8 connected to the DC resistance module are switched to the suspended state; finally, the multi-way selection switches S1, S2, S3 and S4 switch the voltage and current terminals to the insulation resistance measurement module to start the measurement.

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